The "more advanced" ABWR

Primary Containment Vessel

Primary Containment Vessel

The primary containment vessel encloses the reactor pressure vessel, other primary components and piping. In the highly unlikely event of an accident, this shielding prevents the release of radioactive substances.
The ABWR uses a Reinforced Concrete Containment Vessel (RCCV).
Its reinforced concrete outer shell is designed to resist pressure, while the internal steel liner ensures the RCCV is leak-proof.
The compact cylindrical RCCV integrated into the reactor building enjoys the advantages of earthquake-resistant design and economic construction cost.